ORA Relay · OFD

What it does

App / commissioner toggles the relay over Matter (On/Off cluster).
Local push-button (active-low) toggles the relay with one tap.
Five quick taps on the same button → factory reset.
LED1 mirrors relay state. LED2 blinks during BLE commissioning, off when provisioned.

Pinout (nRF54L15)

Pin	Role	DT alias	Notes
`P1.05`	Relay drive	`relay`	Active-high, `gpio-leds` node
`P1.14`	LED1	`led1`	Active-high. Mirrors On/Off state.
`P1.04`	LED2	`led2`	Commissioning indicator.
`P1.06`	Switch	`sw0`	Pull-up, active-low. GPIO interrupt.
`P1.11`	UART21 TX	—	Reserved for app-level UART.
`P1.12`	UART21 RX	—	Reserved for app-level UART.
`P0.00`	Console TX	uart30	vcom0 / `/dev/ttyACM0`
`P0.01`	Console RX	uart30	vcom0 / `/dev/ttyACM0`

Matter endpoints

EP0 — Root device (code 22)
EP1 — On/Off Plug-in Unit (code 266) with clusters: Identify, Groups, On/Off, Power Source, Scenes Management

Build (one-shot)

cat > /tmp/build_ora_relay.sh << 'EOF'
#!/bin/bash
source /home/voltex-aura/ncs/v3.2.2/ora/blinky/.venv/bin/activate
TC=/home/voltex-aura/ncs/toolchains/927563c840
CHIP_CERT=/home/voltex-aura/chip/third_party/openthread/ot-realtek/third_party/Realtek/rtl87x2g_sdk/subsys/matter/vendor/factory_data/tool
export PATH=$CHIP_CERT:$TC/bin:$TC/usr/bin:$TC/usr/local/bin:$TC/opt/bin:$TC/nrfutil/bin:$PATH
export LD_LIBRARY_PATH=$TC/lib:$TC/lib/x86_64-linux-gnu:$TC/usr/local/lib
export ZEPHYR_SDK_INSTALL_DIR=$TC/opt/zephyr-sdk
export ZEPHYR_TOOLCHAIN_VARIANT=zephyr
export ZEPHYR_BASE=/home/voltex-aura/ncs/v3.2.2/zephyr
export NRFUTIL_HOME=$TC/nrfutil/home
west build -p -b nrf54l15dk/nrf54l15/cpuapp \
  -s /home/voltex-aura/ncs/v3.2.2/ora/ora_relay \
  -d /home/voltex-aura/ncs/v3.2.2/ora/ora_relay/build \
  -- -DFILE_SUFFIX=internal
EOF
chmod +x /tmp/build_ora_relay.sh && bash /tmp/build_ora_relay.sh

Flash

TC=/home/voltex-aura/ncs/toolchains/927563c840
HEX=/home/voltex-aura/ncs/v3.2.2/ora/ora_relay/build/merged.hex
export PATH=$TC/nrfutil/bin:$TC/bin:$PATH
export NRFUTIL_HOME=$TC/nrfutil/home
SN=$(nrfutil device list 2>&1 | head -1)
nrfutil device recover --serial-number $SN
nrfutil device recover --serial-number $SN     # yes, twice
nrfutil device program --firmware $HEX --serial-number $SN --core Application
nrfutil device reset --serial-number $SN

VS Code (nRF Connect extension)

Add Build Configuration with:

Board target: nrf54l15dk/nrf54l15/cpuapp
Extra CMake arguments: -DFILE_SUFFIX=internal
Sysbuild: enabled

Memory footprint (verified 2026-05-18)

FLASH:  689968 B / 862 KB  (78.17%)
RAM:    175532 B / 256 KB  (66.96%)

Gotchas

nrfutil device recover sometimes needs to run twice before program works.
The .zap in src/default_zap/ora_relay.zap is a symlink into the firmware-designer workspace — don't break it.
Single .zap file → no -z flag needed for west zap-generate.
gpio2 has no GPIOTE — keep the button on P1.06 (current pin) or another P0/P1 pin.